CN112533255B - Terminal switching control method, base station and storage medium - Google Patents
Terminal switching control method, base station and storage medium Download PDFInfo
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- CN112533255B CN112533255B CN201910877780.0A CN201910877780A CN112533255B CN 112533255 B CN112533255 B CN 112533255B CN 201910877780 A CN201910877780 A CN 201910877780A CN 112533255 B CN112533255 B CN 112533255B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The embodiment of the invention provides a terminal mode switching control method, a base station and a storage medium, wherein after a source side determines that a first terminal needs to perform mode switching, a switching reconfiguration message for indicating the first terminal to perform mode switching is generated, and the switching reconfiguration message comprises target configuration information used after the first terminal is switched to a target mode; and then, the source side stops carrying out uplink scheduling except for SR on the first terminal, and then sends a switching reconfiguration message to the first terminal. Because the uplink scheduling of the first terminal except the SR is stopped before the switching reconfiguration message is sent, during the period of sending the switching reconfiguration message, the first terminal does not have other uplink information except the uplink sending of the SR, and the sending mode of the switching reconfiguration message is more suitable for the half-duplex working characteristic of the terminal in eMTC, so that the sending success rate of the switching reconfiguration message can be obviously improved, the switching success rate of the terminal is improved, and the user experience is enhanced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a terminal handover control method, a base station, and a storage medium.
Background
eMTC (enhanced Machine-Type Communication) is proposed in the 3GPP R13 protocol to support handover functions, enabling inter-band, inter-system and intra-cell handover. eMTC is proposed in the 3gpp r14 protocol to support ModeB functionality. Therefore, in the terminal mobility management, seamless switching between ModeA and ModeB modes between coverage of different regions can be realized under the scenes of different coverage levels of the same cell, so that user perception is improved.
The communication configuration information in the ModeA mode and the ModeB mode in eMTC has larger difference, and the terminal in eMTC has half-duplex working characteristics, so that the scheduling strategy of the MAC layer in the switching process is more complex than that in LTE (Long Term Evolution ), and therefore, if the switching is performed according to the switching strategy in LTE, the switching is easy to fail, thereby influencing the user experience.
Disclosure of Invention
The terminal switching control method, the base station and the storage medium mainly solve the technical problems that in the related art, the terminal in eMTC is controlled to switch according to the switching strategy in LTE, switching failure is easy to cause, and user experience is low.
In order to solve the above technical problems, an embodiment of the present invention provides a terminal switching control method, including:
generating a switching reconfiguration message for indicating the first terminal to perform mode switching, wherein the switching reconfiguration message comprises target configuration information used after the first terminal is switched to a target mode;
stopping performing other uplink scheduling except a scheduling request SR on the first terminal;
and sending the switching reconfiguration message to the first terminal.
The embodiment of the invention also provides a base station, which comprises a processor, a memory and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute one or more programs stored in the memory, so as to implement the steps of the terminal handover control method.
The embodiment of the invention also provides a computer storage medium, wherein the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to realize the steps of the terminal switching control method.
The beneficial effects of the invention are as follows:
the terminal switching control method, the base station and the storage medium provided by the embodiment of the invention generate a switching reconfiguration message for indicating the first terminal to perform mode switching after determining that the first terminal needs to perform mode switching on a source side, wherein the switching reconfiguration message comprises target configuration information used after the first terminal is switched to a target mode; and then, the source side stops carrying out uplink scheduling except for SR on the first terminal, and then sends a switching reconfiguration message to the first terminal. Because the source side stops carrying out other uplink scheduling except for SR on the first terminal before sending the switching reconfiguration message, during the period that the source side sends the switching reconfiguration message to the first terminal, the first terminal does not have other uplink information except for the uplink sending of SR, and the sending mode of the switching reconfiguration message is more suitable for the half-duplex working characteristic of the terminal in eMTC, so that the sending success rate of the switching reconfiguration message can be obviously improved, the switching success rate of the terminal is improved, and the user experience is enhanced.
Additional features and corresponding advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a terminal switching control method according to a first embodiment of the present invention;
fig. 2 is an interactive flowchart of a source side acquiring terminal target configuration information from a target side according to a first embodiment of the present invention;
fig. 3 is a flowchart of switching a first terminal to a target side according to a first embodiment of the present invention;
fig. 4 is an interaction flow chart of a terminal handover control method shown in example 1 of the second embodiment of the present invention;
fig. 5 is an interactive flowchart of a terminal handover control method shown in example 2 of the second embodiment of the present invention;
fig. 6 is an interactive flowchart of a terminal handover control method shown in example 3 of the second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a terminal switching control device according to a third embodiment of the present invention;
fig. 8 is a schematic diagram of another configuration of a terminal switching control device according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a terminal switching control device according to a third embodiment of the present invention;
fig. 10 is a schematic diagram of a hardware structure of a base station according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention is given with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Embodiment one:
there are some differences in communication configuration information in ModeA mode and ModeB mode of eMTC, such as: the number of HARQ (Hybrid Automatic Repeat Request), the number of HARQ (hybrid automatic repeat request) processes, the PRBSet (Physical Resource Block Set, physical resource block group), the eCCE (Enhanced Control Channel Element, enhanced control channel resource) Level, the MPDCCH (MTCPhysical Downlink Control Channel, machine type communication physical downlink control channel) maximum number of repetitions, the PDSCH (Physical Downlink Shared Channel ) maximum number of repetitions, the PUCCH (Physical Uplink Control Channel ) maximum number of repetitions, and the like are all different, and since the communication between the terminal and the base station in eMTC is half duplex, this results in the problems of complicated handover of the terminal in eMTC, low success rate, and poor user experience. In order to solve these problems, the present embodiment provides a terminal handover control method, please refer to the flowchart shown in fig. 1:
s102: a handover reconfiguration message is generated for instructing the first terminal to perform a mode handover.
The mode switching in this embodiment includes not only switching between ModeA and ModeB in eMTC, but also switching between CE levels (coverage enhancement levels) in ModeA and switching between CE levels in ModeB. For example, in some examples of the present embodiment, a base station (eNodeB) source side determines, according to a measurement report reported by a terminal, that the terminal needs to be handed over from CE0 in ModeA to CE2 in ModeB where the terminal is currently located. In other examples, the base station determines that one terminal needs to switch from CE0 to CE1 in ModeA, while another terminal may need to switch from CE2 to CE3 in ModeB.
It will be appreciated that in some examples, when a terminal performs a handover, only a mode handover is performed, but the base station to which it belongs does not change the cell to which it belongs. In other examples of this embodiment, however, the terminal is not only changed in mode but also changes to the cell or base station to which it belongs. It should be understood that if the terminal performs only mode switching, the cell to which the terminal belongs before and after switching is the same as the base station, and thus the source base station and the target base station of the terminal switching process are the same, and the source cell and the target cell are the same. But if the mode switch of the terminal is also accompanied by a cell switch, the source cell and the target cell of the switch procedure will be different. If the base stations to which the terminal belongs before and after the terminal is switched are still the same, the source base station and the target base station in the terminal switching process are the same. However, if the base station to which the terminal belongs before and after switching is also changed, the source base station and the target base station in the switching process are also different.
In this embodiment, when the source side (determined according to the handover situation, may be a source base station or may be a source cell) determines that the first terminal needs to perform mode handover, a handover reconfiguration message for instructing the first terminal to perform handover may be generated. According to the handover reconfiguration message, the first terminal may determine which mode it needs to switch to, that is, which target mode it performs mode switching to, and determine configuration information used after switching to the target mode. The configuration information used after the first terminal is switched to the target mode is referred to herein as "target configuration information".
In some scenarios, the target configuration information in the handover reconfiguration message is determined by the source side itself, for example, in a handover scenario in which the source cell and the target cell are the same cell, the source side will determine the target configuration information of the first terminal itself. In other examples of this embodiment, when the handover procedure of the first terminal involves handover of a base station or handover of a cell, because the source base station is different from the target base station or the source cell is different from the target cell, the target configuration information adopted by the first terminal after handover should be determined by the target cell (possibly a cell belonging to the same base station as the source cell or a cell belonging to a different base station as the source cell), in which case, when the source side determines that the first terminal needs to perform handover, the target configuration information of the first terminal is obtained by interacting with the target cell, for example, please refer to an interaction flow chart shown in fig. 2:
s202: the first terminal reports the measurement report of the first terminal to the source side.
In general, the terminal reports its own Measurement Report (MR), which is one of the bases for the base station to evaluate the quality of the wireless communication environment of the terminal, to the base station, where the MR may include a measurement result of the signal quality of the current serving cell of the terminal, a measurement result of the signal quality of the neighboring cell, and so on.
S204: the source side determines that the first terminal needs to be switched to the target side according to the measurement report of the first terminal.
After receiving the measurement report reported by the first terminal, the source side can determine whether the first terminal needs to switch currently according to the measurement report, and determine a target cell and a target mode of the first terminal to switch when the first terminal needs to switch. The target cell may be a cell belonging to the same base station as the source side, or may be a cell different from the base station to which the source side belongs.
In this example, it is assumed that the source side determines that the cell to which the first terminal belongs needs to be switched, and the target cell after switching is different from the cell to which the first terminal originally belongs.
S206: the source side sends a switching request to the target side.
After determining that the handover of the first terminal needs to be switched to the target mode of the target cell, the source cell may send a handover request to the target cell, requesting to switch the first terminal to the target cell.
S208: and the target side feeds back a switching response carrying the target configuration information to the source side.
After receiving the handover request sent by the source cell, the target cell performs processing such as authorization control, and then sends a handover response to the source cell. If the target cell agrees to switch the first terminal to the cell, the switching response fed back by the target cell to the source cell contains target configuration information configured for the first terminal.
Whether the target configuration information of the first terminal is configured by the source side or the target configuration information of the first terminal is acquired from the target side, after the source side acquires the target configuration information of the first terminal, the switching reconfiguration message is generated according to the target configuration information by reducing fire.
S104: and stopping performing other uplink scheduling except the scheduling request SR on the first terminal.
After the handover reconfiguration message is generated, the source side may stop performing uplink scheduling other than SR (scheduling request) on the first terminal, so as to reduce occupation of communication resources by the uplink scheduling, thereby freeing up more communication resources to prepare for downlink transmission of the handover reconfiguration message.
In this embodiment, the SR of the first terminal is not directly stopped, mainly because the terminal transmits the SR to the base station side in a timing manner, and if the terminal transmits the SR several times in succession, the terminal retransmits the random access procedure without receiving the response from the base station side.
S106: and sending a switching reconfiguration message to the first terminal.
After stopping the uplink scheduling of the first terminal except for the SR, the source side may transmit a handover reconfiguration message to the first terminal.
If the base stations to which the first terminal is switched are the same, after the source side source base station sends the switching reconfiguration message to the first terminal, other uplink scheduling of the first terminal is restored. However, the source base station must ensure that the handover reconfiguration message is not restored to the other uplink scheduling of the first terminal until it has been received by the first terminal, e.g., if the handover reconfiguration message is sent in slices, the source base station must not restore the other uplink scheduling of the first terminal until it is ensured that all of the sliced data of the handover reconfiguration message has been received by the first terminal.
For the terminal side, after receiving the handover reconfiguration message sent by the source side, the first terminal determines a target cell and a target mode to be switched according to the handover reconfiguration message and the measurement report, and target configuration information adopted after the handover. Then, the first terminal initiates a random access procedure to the target side according to the handover reconfiguration message. The flow of switching the first terminal to the target side is described below with reference to the flowchart shown in fig. 3:
s302: and the target side receives the random access request sent by the first terminal.
In this embodiment, the first terminal may initiate the random access request by transmitting Msg1 to the target side.
S304: the target side transmits a random access response to the first terminal.
After receiving the Msg1 sent by the first terminal, the target side feeds back the Msg2 to the first terminal as a response.
S306: the target side and the first terminal take effect of the target configuration information.
After the target side feeds back Msg2 to the first terminal, the target side and the first terminal will take effect of the target configuration information successively.
The following describes the timing of each of the target side and the first terminal to take effect of the target configuration information:
if the current access scenario of the first terminal is a non-contention access scenario, the target side may take effect of the target configuration information after transmitting Msg2 to the first terminal. However, it should be noted that, the validation of the target configuration information at the target side is only the validation at the MAC (Media Access Control, media access control layer), and has not been validated at the bottom layer for a while. The first terminal will send a reconfiguration complete message, that is, an Msg3 message, to the target side after receiving the Msg2 sent by the target side, and will validate the target configuration information after sending the Msg3 message. It can be understood that when the first terminal sends the Msg3 message, it does not use the target configuration information, and the target side has validated the target configuration information, but because the target configuration information is validated only in the MAC layer, and the bottom layer is still the original configuration information used, the target side bottom layer may receive the Msg3 message sent by the first terminal using the target configuration information.
If the current access scene of the first terminal is a contention access scene, after the target side sends the Msg2 message to the first terminal, the first terminal also sends the Msg3 message to the target side, but when the Msg3 message is sent, the target side and the first terminal side do not take effect of the target configuration information. For the first terminal it will validate the target configuration information after sending the Msg3 message, and for the target side it will validate the target configuration information after receiving the Msg3 message.
Description of contention access scenario and non-contention access scenario: contention means a conflict, i.e. a many-to-one situation, i.e. a number of terminals corresponds to a resource, where the resource has two meanings: one layer means PRACH (Physical Random Access channel ) which is a time-frequency resource of a random access preamble and RAPID (Random Access Preamble Identifier, random preamble identity) which is a code resource of a random access preamble, and different terminals contend for both resources. The other layer means C-RNTI (Cell RNTI, cell radio network temporary identity), which is an identity of a terminal in a radio network, allocated by a base station side, and also encounters a situation of contention. Therefore, competition is typically in the following cases:
scene 1: the PRACH channel, RAPID and C-RNTI all need to contend.
Scene 2: the PRACH channel and RAPID need to contend and the C-RNTI is already allocated.
Scene 3: the PRACH channel, as well as the RAPID and the C-RNTI, are already allocated, which is the non-contention situation.
In this embodiment, when the first terminal and the target side validate the target configuration information, rather than just validating the target configuration information for only a part of the target configuration information.
It will be appreciated that, for the source base station or source cell of the first terminal, other terminals, such as a target base station or target cell of the second terminal, are also possible, and therefore, the base station or cell on the source side of the first terminal will also receive the access of the second terminal. For example, assuming that the source base station of the first terminal is base station a, the base station a serves not only as the source base station of the first terminal but also as the target base station of the second terminal. The process of accessing the base station a by the second terminal, and the time for the second terminal and the base station a to take effect on the corresponding target configuration information may refer to the process of accessing the first terminal to the target side:
for the base station a, it receives a random access request (Msg 1) sent by the second terminal, and then sends a random access response (Msg 2) to the second terminal; if the current access of the second terminal is in a non-contention access scenario, the base station A will take effect of the target configuration information corresponding to the second terminal in the MAC layer after sending the random access response. In some cases, the base station a may take effect of the target configuration information corresponding to the second terminal at the MAC layer immediately after sending the random access response, where "immediately" does not strictly control the take-effect time within how many milliseconds, but means that the base station a can take effect of the target configuration information corresponding to the second terminal without performing other interactions with the second terminal after sending the random access response.
If the current access of the second terminal is in the contention access scenario, the base station A receives a reconfiguration complete message (Msg 3) sent by the second terminal after sending a random access response (Msg 2), and validates target configuration information corresponding to the second terminal after receiving the reconfiguration complete message.
It can be understood that if the base station to which the first terminal belongs before and after switching is unchanged, the base station serves as both the source base station and the target base station, and a reconfiguration complete message, that is, an Msg3 message, will be sent after the first terminal successfully switches to the target mode. After receiving the Msg3 message, the base station may determine that the first terminal has successfully switched to the target mode.
It will be appreciated that, for a terminal, before performing mode switching, the base station side allocates a part of air interface resources to the terminal according to the original configuration information, and after performing mode switching, the base station side allocates a part of air interface resources to the terminal according to the target configuration information. If the cells to which the first terminal belongs before and after the mode switching are different, for example, the first terminal is switched from one cell under the base station A to another cell through switching, or the first terminal is switched from the base station A to the base station B through switching, after the switching of the first terminal is completed, the higher layer sends a UE release message to the MAC layer, so that the MAC releases the air interface resources allocated to the first terminal according to the original configuration information. However, if the cells to which the first terminal belongs before and after the mode switching is performed are the same, that is, the first terminal performs only the mode switching without cell switching or base station switching, after the first terminal completes the mode switching, the higher layer will not instruct the MAC layer to release the air interface resources configured for the first terminal according to the original configuration information through the UE message, so that the base station to which the first terminal belongs is required to recover the air interface resources allocated according to the original configuration information, and delete the stored original configuration information.
According to the terminal switching control method provided by the embodiment of the invention, in the process of mode switching of the terminal, the source side pauses uplink scheduling except SR (scheduling request) of the terminal before sending the switching reconfiguration message to the terminal, so that the terminal under a half-duplex working mechanism has higher possibility of successfully receiving the switching reconfiguration message, and the success rate of terminal switching is further improved.
Embodiment two:
in order to make the advantages and details of the terminal switching control method provided in the foregoing embodiments more apparent to those skilled in the art, the present embodiment will further describe the terminal switching control method with reference to examples:
example 1:
assuming that the cells to which the terminal belongs before and after switching are the same, the source cell is the same as the target cell, and the source base station is the same as the target base station. Referring to the flowchart shown in fig. 4, it is assumed that the cell to which the terminal belongs before and after handover is cell a:
s402: cell a receives a measurement report sent by a terminal;
in this embodiment, it is assumed that cell a determines that the terminal needs to perform mode switching according to the measurement report.
S404: the cell a determines target configuration information of the terminal in a target mode and generates a switching reconfiguration message;
s406: cell a stops uplink scheduling except for terminal SR;
s408: cell a sends a handover reconfiguration message to the terminal;
s410: the terminal is switched to a target mode according to the target configuration information in the switching reconfiguration message;
for the flow of the terminal switching to the target mode according to the switching reconfiguration message, please refer to the description of the foregoing embodiment, and the description is omitted herein.
S412: and the cell a recovers the air interface resources allocated to the terminal according to the original configuration information and deletes the original configuration information.
Example 2:
assuming that the cells to which the terminal belongs before and after handover are different, but the base stations are the same, wherein the source cell is cell a and the target cell is cell b, please refer to the flow chart shown in fig. 5:
s502: cell a receives a measurement report sent by a terminal;
in this embodiment, it is assumed that cell a determines that the terminal needs to perform mode switching according to the measurement report, and the terminal will switch from the own cell to cell b.
S504: cell a sends a handover request to cell b.
S506: the cell b performs authorization control;
s508: cell b feeds back a handover response to cell a;
the switching response fed back to the cell a by the cell b carries the target configuration information adopted after the terminal is switched.
S510: the cell a generates a switching reconfiguration message according to the target configuration information in the switching response;
s512: cell a stops uplink scheduling except for terminal SR;
s514: cell a sends a handover reconfiguration message to the terminal;
s516: the terminal sends an Msg1 message to a cell b;
s518: cell b sends Msg2 message to the terminal;
assuming that the random access procedure initiated by the terminal currently towards cell b is a contention access procedure, then:
s520: the terminal sends an Msg3 message to the cell b;
s522: and the terminal and the cell b respectively take effect on the target configuration information.
For the case that the access initiated by the terminal to the cell b belongs to a non-contention access scenario, the effective time of the terminal and the cell b for the target configuration information will be different from that in fig. 5, and will not be described again here.
Example 3:
assuming that the base stations to which the terminal belongs before and after switching are different, wherein the source base station is base station c, and the target base station is base station d, please refer to the flowchart shown in fig. 6:
s602: the base station c receives a measurement report sent by a terminal;
in this embodiment, it is assumed that the base station c determines that the terminal needs to perform mode switching according to the measurement report, and the terminal will switch from the present base station to the base station d.
S604: the base station c sends a handover request to the base station d.
S606: the base station d performs authorization control;
s608: the base station d feeds back a switching response to the base station c;
the switching response fed back by the base station d to the base station c carries the target configuration information adopted after the terminal is switched.
S610: the base station c generates a switching reconfiguration message according to the target configuration information in the switching response;
s612: the base station c stops uplink scheduling except the terminal SR;
s614: the base station c sends a switching reconfiguration message to the terminal;
s616: the terminal sends an Msg1 message to a base station d;
s618: the base station d sends an Msg2 message to the terminal;
assuming that the random access procedure currently initiated by the terminal to the base station d is a non-contention access procedure, then:
s620: the base station d takes effect of the target configuration information corresponding to the terminal in the MAC layer;
s622: the terminal sends an Msg3 message to the base station d;
s622: the terminal validates the target configuration information.
For the case that the access initiated by the terminal to the base station d belongs to the contention access scenario, the effective time of the terminal and the base station d for the target configuration information will be different from that in fig. 6, and will not be described again here.
According to the terminal switching control method, the characteristic of half duplex of the eMTC Internet of things is combined, uplink scheduling of the terminal is limited in the switching process, the probability that the terminal receives the switching reconfiguration message sent by the source side is improved, and the switching success rate of the system is improved.
Embodiment III:
the present embodiment provides a terminal switching control device, which may be deployed on a base station side, so as to implement a flow of a source side in the foregoing terminal switching control method, please refer to a schematic structural diagram of the terminal switching control device shown in fig. 7:
the terminal switching control device 70 includes a message generating module 702, a scheduling limiting module 704, and a message sending module 706, where the message generating module 702 generates a switching reconfiguration message for instructing the first terminal to perform mode switching, and the switching reconfiguration message includes target configuration information used after the first terminal switches to a target mode; the scheduling restriction module 704 is configured to stop performing uplink scheduling other than SR on the first terminal, and the message sending module 706 is configured to send a handover reconfiguration message to the first terminal.
The mode switching in this embodiment includes not only switching between ModeA and ModeB in eMTC, but also switching between CE levels in ModeA and switching between CE levels in ModeB. For example, in some examples of the present embodiment, the source side of the base station determines, according to a measurement report reported by a terminal, that the terminal needs to switch from CE0 in ModeA to CE2 in ModeB where the terminal is currently located. In other examples, the base station determines that one terminal needs to switch from CE0 to CE1 in ModeA, while another terminal may need to switch from CE2 to CE3 in ModeB.
If the cells to which the first terminal mode belongs are different before and after switching, before the message generating module 702 generates the switching reconfiguration message, the terminal switching control device 70 should also receive the measurement report reported by the first terminal, and determine that the first terminal needs to be switched to the target cell in the target mode according to the measurement report; then, the terminal handover control apparatus 70 sends a handover request to the target cell, and receives a handover response carrying the target configuration information sent by the target cell.
If the cells to which the first terminal belongs before and after the mode switching is performed, after the message sending module 706 sends the switching reconfiguration message to the first terminal, the terminal switching control device 70 further deletes the original configuration information of the first terminal after the target configuration information of the first terminal takes effect, and recovers the air interface resources allocated to the first terminal according to the original configuration information. In the terminal switching control device 70 provided in some examples of the present embodiment, referring to fig. 8, the terminal switching control device 70 further includes a resource recycling module 708, where the resource recycling module 708 is configured to delete original configuration information of the first terminal after the target configuration information of the first terminal is validated, and recycle air interface resources allocated to the first terminal according to the original configuration information.
If the base stations to which the first terminal belongs before and after switching are the same, after the message sending module 706 sends the switching reconfiguration message to the first terminal, the scheduling restriction module 704 will release other uplink scheduling for the first terminal.
In some examples of this embodiment, referring to fig. 9, the terminal handover control apparatus 70 further includes an access control module 710, where the access control module 710 is configured to receive a random access request sent by the second terminal, and send a random access response to the second terminal. If the current access of the second terminal is in a non-contention access scenario, the access control module 710 will immediately take effect of the target configuration information corresponding to the second terminal at the MAC layer after sending the random access response. If the current access of the second terminal is in the contention access scenario, the access control module 710 will receive the reconfiguration complete message sent by the second terminal after sending the random access response, and take effect of the target configuration information corresponding to the second terminal after receiving the reconfiguration complete message.
In this embodiment, when the target configuration information corresponding to the second terminal is validated, the access control module 710 validates all configurations in the target configuration information corresponding to the second terminal.
Because the terminal handover control apparatus 70 may be disposed on the base station side, it is understood that the functions of the message generating module 702, the scheduling restriction module 704, and the resource recycling module 708 may be implemented by a processor on the base station side, and the functions of the message sending module 706 and the access control module 710 may be implemented by a processor on the base station side together with the communication unit.
In the terminal switching control device provided by the embodiment, in the process of performing mode switching on the terminal, the source side pauses uplink scheduling except for SR on the terminal before sending the switching reconfiguration message to the terminal, so that the terminal under the half-duplex working mechanism has higher possibility of successfully receiving the switching reconfiguration message, and the success rate of terminal switching is further improved.
Embodiment four:
the present embodiment provides a storage medium in which one or more computer programs that can be read, compiled and executed by one or more processors may be stored, and in this embodiment, the storage medium may store a terminal switching control program that can be used by one or more processors to execute a flow of implementing any one of the terminal switching control methods described in the foregoing embodiments.
In addition, the present embodiment provides a base station, as shown in fig. 10: the base station 100 comprises a processor 101, a memory 102 and a communication bus 103 for connecting the processor 101 and the memory 102, wherein the memory 102 may be the aforementioned storage medium storing the terminal switching control program. The processor 101 may read the terminal switching control program, compile and execute the flow of implementing the terminal switching control method in the foregoing embodiment:
the processor 101 generates a handover reconfiguration message for instructing the first terminal to perform mode handover, stops performing uplink scheduling other than the scheduling request SR for the first terminal, and then sends the handover reconfiguration message to the first terminal. The switching reconfiguration message includes target configuration information used after the first terminal switches to the target mode.
The mode switching in this embodiment includes not only switching between ModeA and ModeB in eMTC, but also switching between CE levels in ModeA and switching between CE levels in ModeB. For example, in some examples of the present embodiment, the source side of the base station determines, according to a measurement report reported by a terminal, that the terminal needs to switch from CE0 in ModeA to CE2 in ModeB where the terminal is currently located. In other examples, the base station determines that one terminal needs to switch from CE0 to CE1 in ModeA, while another terminal may need to switch from CE2 to CE3 in ModeB.
If the cells to which the first terminal mode belongs are different before and after switching, before the processor 101 generates a switching reconfiguration message, the processor 101 should also receive a measurement report reported by the first terminal, and determine that the first terminal needs to be switched to a target cell target mode according to the measurement report; then, the processor 101 sends a handover request to the target cell, and receives a handover response carrying the target configuration information sent by the target cell.
If the cells to which the first terminal belongs before and after the mode switching is performed are the same, after the processor 101 sends the switching reconfiguration message to the first terminal, the processor 101 further deletes the original configuration information of the first terminal after the target configuration information of the first terminal is validated, and recovers the air interface resources allocated to the first terminal according to the original configuration information.
If the base stations to which the first terminal belongs before and after switching are the same, after the processor 101 sends a switching reconfiguration message to the first terminal, the processor 101 will release other uplink scheduling to the first terminal.
In some examples of this embodiment, the processor 101 also receives a random access request sent by the second terminal and sends a random access response to the second terminal. If the current access of the second terminal is in a non-contention access scenario, the processor 101 will immediately validate the target configuration information corresponding to the second terminal at the MAC layer after sending the random access response. If the current access of the second terminal is in the contention access scenario, the processor 101 will receive the reconfiguration complete message sent by the second terminal after sending the random access response, and take effect of the target configuration information corresponding to the second terminal after receiving the reconfiguration complete message.
In this embodiment, when the target configuration information corresponding to the second terminal is validated, the processor 101 validates all configurations in the target configuration information corresponding to the second terminal.
In the mode switching process of the terminal, the base station provided by the embodiment suspends uplink scheduling except for SR on the terminal before issuing the switching reconfiguration message to the terminal, so that the terminal under the half-duplex working mechanism has higher possibility of successfully receiving the switching reconfiguration message, and further the success rate of terminal switching is improved.
It is to be understood that features of embodiments of the invention may be used in combination without conflict.
It will be apparent to one skilled in the art that all or some of the steps of the methods, systems, functional modules/units in the apparatus disclosed above may be implemented as software (which may be implemented in program code executable by a computing apparatus), firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media), for execution by a computing device, and in some cases, the steps shown or described may be performed in a different order than that described herein. The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Therefore, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a further detailed description of embodiments of the invention in connection with the specific embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (9)
1. A terminal switching control method comprises the following steps:
generating a switching reconfiguration message for indicating the first terminal to perform mode switching, wherein the switching reconfiguration message comprises target configuration information used after the first terminal is switched to a target mode;
stopping performing other uplink scheduling except a scheduling request SR on the first terminal;
sending the switching reconfiguration message to the first terminal;
if the cells to which the first terminal belongs before and after the mode switching are the same, after the switching reconfiguration message is sent to the first terminal, the method further comprises:
and deleting the original configuration information of the first terminal after the target configuration information of the first terminal is effective, and recovering the air interface resources distributed to the first terminal according to the original configuration information.
2. The method for controlling terminal switching according to claim 1, wherein, if the cells to which the first terminal belongs before and after mode switching are different, before generating the switching reconfiguration message for instructing the first terminal to perform mode switching, the method further comprises:
receiving a measurement report reported by the first terminal;
determining that the first terminal needs to be switched to a target mode of a target cell according to the measurement report;
sending a switching request to the target cell;
and receiving a switching response carrying target configuration information sent by the target cell.
3. The method for controlling terminal handover according to claim 1, wherein after the sending the handover reconfiguration message to the first terminal, if the base stations to which the first terminal belongs before and after the handover are the same, further comprising:
and restoring other uplink scheduling of the first terminal.
4. The method for controlling terminal switching according to claim 3, wherein after the recovery of the other uplink scheduling of the first terminal, further comprising:
and receiving reconfiguration completion information sent by the first terminal after the first terminal is successfully switched to the target mode.
5. The method of claim 1, wherein the mode switching includes switching between ModeA and ModeB in enhanced machine type communication eMTC, switching between CE levels of coverage enhancement levels in ModeA, and switching between CE levels in ModeB.
6. The terminal switching control method according to any one of claims 1 to 5, characterized in that the terminal switching control method further comprises:
receiving a random access request sent by a second terminal;
transmitting a random access response to the second terminal;
if the current access of the second terminal is a non-competitive access scene, the target configuration information corresponding to the second terminal is validated at the MAC layer after the random access response is sent;
and if the current access of the second terminal is in a contention access scene, receiving a reconfiguration completion message sent by the second terminal after sending the random access response, and validating target configuration information corresponding to the second terminal after receiving the reconfiguration completion message.
7. The terminal handover control method of claim 6, wherein validating the target configuration information corresponding to the second terminal comprises:
and validating all the configurations in the target configuration information corresponding to the second terminal.
8. A base station comprising a processor, a memory, and a communication bus;
the communication bus is used for realizing connection communication between the processor and the memory;
the processor is configured to execute one or more programs stored in a memory to implement the steps of the terminal handover control method according to any one of claims 1 to 7.
9. A storage medium storing one or more programs executable by one or more processors to implement the steps of the terminal switching control method of any one of claims 1 to 7.
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| CN201910877780.0A CN112533255B (en) | 2019-09-17 | 2019-09-17 | Terminal switching control method, base station and storage medium |
| PCT/CN2020/115624 WO2021052368A1 (en) | 2019-09-17 | 2020-09-16 | Switching control method for terminal, base station, and storage medium |
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